Hi, I'm
Maciek

I'm a Senior PM specialising in product data, search, and AdTech - with a portfolio of building and shipping mobile games independently. I love taking products from idea to App Store, applying the same rigour I bring to my daily product work: user research, experimentation, data-informed iteration, and a core focus on the end experience.

Open to opportunities maciekzak96@gmail.com LinkedIn ↗
Maciek Zak

Shipped Apps

04 projects
Dropletts icon
Live
Dropletts
Arcade Word Game · 2026

An arcade word game built as an experiment in AI-assisted product development, shipping a fully functioning product using LLMs throughout the entire development cycle, from concept to App Store.

Shipped end-to-end using AI-assisted development over a 6-month cycle using prompts only
Identified optimal prompting strategies to maintain LLM context throughout long development cycles
Gained hands-on insight into where AI accelerates delivery vs. where human judgement is irreplaceable
AI-assisted devCodexUnityiOS & Android
Pink Penguin icon
Live
Pink Penguin
Puzzle Game · 2024

A mobile puzzle game independently designed, built, and launched in 6 months. Worked with professional graphic and sound designers to synchronise work and define a vision of the final experience.

Featured in Apple App Store 'New Games We Love' in 150+ countries
Reached Top 10 Paid Puzzle Games on App Store in 22 countries
Generated £1k revenue; designed, built, and published in 6 months
Level DesignC#UnityiOS
Hot Dot icon
Past project
Hot Dot!
Hypercasual Game · 2019

A hypercasual game with a goal of understanding and leveraging game polish and marketing to gain visibility.

Ideated, sketched and prototyped unique game mechanic by researching current hyper-casual games and game design principles
Ran user surveys and beta testing to iterate on UX based on qualitative and quantitative feedback
Promoted game by learning about advertising strategies and utilising storytelling to gain an Apple App Store feature
Featured on the Apple App Store 'New Games We Love' section in over 100 countries - 15k downloads
C# Unity iOS
Scoop Hoop icon
Past project
Scoop Hoop
Hypercasual Game · 2019

My initial leap into independent gamedev, used as a working project and personal challenge to learn Unity development.

Self-taught Unity software and C# language by following online tutorials and documentation
Produced MVP of mobile game in just 1 week by prioritising backlog for crucial usability elements and streamlining game flow
Created a continuous game mechanic to improve user retention by researching UX and UI design and game psychology
Featured on the Apple App Store 'Updated and Upgraded' section in over 10 countries - 5k downloads
C# Unity iOS & Android

What shipping apps taught me about PM

Lessons from solo projects, from idea to publishing

🔬

User feedback is always surprising

Users know what they want better than you, so take feedback seriously but weigh it up against feasibility and timelines.

📊

Metrics Really Matter

Chart topping apps are not there by accident, but are a result of behind the scenes retention, LTV, and engagement. Learning to track these metrics early and iterate is crucial.

📣

Storytelling & Distribution is how people find you

It doesn't matter if your product is perfect if no-one will hear about it. I've learned to think about marketing angles from the very conception of the project to maximise coverage and featuring opportunities.

🚀

Deadlines are a must

Idea to published app in 6 months really forces me to evaluate scope and prioritise the backlog, which has helped shape my instinct for criticality and feasibility of features.

👥

You must always think about the user

10 satisfied users are better than 100 who uninstall the next day, and users recognise features made with purpose.

🤖

AI can be a catalyst but not a replacement

Building Dropletts with LLMs gave me first-hand insight into where AI genuinely accelerates delivery and where it falls short — increasingly relevant to every product team.

Professional Experience

Senior PM in retail, ecommerce, and AdTech

Waitrose
Nov 2023 – Present
Senior Product Manager - AdTech & Product Data
Leading multiple teams simultaneously as a Senior PM at Waitrose digital. Driving £15m+ retail media revenue, decommissioning legacy data system saving £10m in annual licence costs, and building an experimentation culture across search and advertising placements.
Holland & Barrett
Nov 2021 – Nov 2023
Product Manager - PIM & Product Data
My first product manager role owning the full scope of the product and managing a developer team. Built and launched an internal PIM system from scratch in 9 months, reducing publishing time from 20 minutes to instant and saving £500k annually through legacy decommissioning.
Accenture
Mar 2019 – Nov 2021
PIM Consultant
Graduate role covering a number of projects where I first came across my love for product management. Configured bespoke Master Data Management software for a major retail client, reducing onboarding time by 15% and cutting data errors by 30% through automated validation.